J/ApJ/748/93ivo://CDS.VizieR/J/ApJ/748/93doi:10.26093/cds/vizier.17480093CDSRojas-Ayala B.Covey K.R.Muirhead P.S.Lloyd J.P.2017-07-04T07:08:36Z2013-11-18T08:42:25ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frchemical-abundanceseffective-temperatureinfrared-astronomyspectroscopystellar-spectral-typesm-starsline-intensitiesWe present K-band spectra for 133 nearby (d < 33 pc) M dwarfs, including 18 M dwarfs with reliable metallicity estimates (as inferred from an FGK type companion), 11 M dwarf planet hosts, more than 2/3 of the M dwarfs in the northern 8 pc sample, and several M dwarfs from the LSPM catalog. From these spectra, we measure equivalent widths of the Ca and Na lines, and a spectral index quantifying the absorption due to H_2_O opacity (the H_2_O-K2 index). Using empirical spectral type standards and synthetic models, we calibrate the H_2_O-K2 index as an indicator of an M dwarf's spectral type and effective temperature. We also present a revised relationship that estimates the [Fe/H] and [M/H] metallicities of M dwarfs from their Na I, Ca I, and H_2_O-K2 measurements. Comparisons to model atmosphere provide a qualitative validation of our approach, but also reveal an overall offset between the atomic line strengths predicted by models as compared to actual observations. Our metallicity estimates also reproduce expected correlations with Galactic space motions and H{alpha} emission line strengths, and return statistically identical metallicities for M dwarfs within a common multiple system. Finally, we find systematic residuals between our H_2_O-based spectral types and those derived from optical spectral features with previously known sensitivity to stellar metallicity, such as TiO, and identify the CaH1 index as a promising optical index for diagnosing the metallicities of near-solar M dwarfs.2012ApJ...748...93Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/748/93CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)I/238 : Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)III/114 : Spectra of Late-Type Standards, 2.0-2.5 Microns (Kleinmann+ 1986)J/MNRAS/403/1949 : UBV(RcIc)JHK photometry of HIP nearby stars (Koen+, 2010)J/ApJ/704/975 : Rotational velocities for M dwarfs (Jenkins+, 2009)J/ApJ/701/764 : Light curves for five M-dwarf stars (Fernandez+, 2009)J/A+A/493/645 : Gl 176 radial velocities (Forveille+, 2009)J/PASP/121/117 : Fe & Ti abundances of 12 M stars (Woolf+, 2009)J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)J/AJ/123/3356 : PMSU nearby star spectroscopic survey. III. (Gizis+, 2002)J/A+A/364/665 : Very low mass stars radial velocities (Segransan+, 2000)J/A+A/331/581 : Rotation and activity in field M dwarfs (Delfosse+ 1998)J/AJ/113/806 : M-Subdwarfs (Gizis 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/748/93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/748/93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/748/93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/748/93https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/748/93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/748/93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/748/93/stars (TripleSpec nearby M dwarf sample: properties and spectral measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/93/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/93/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/93/stars?GETtext/xml+votable180.050000true311.091437219.74968640.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/748/936/250 309 527 1875 1953 2330 2782 2922 3005 3293 3345 3659 3715 3751 3837 3889 4158 4444 4693 4867 5000 5009 5304 5420 5488 5534 6672 6705 6726 6750 6894 6974 7181 7264 7395 8023 9146 9383 9629 9696 9801 10149 10169 11636 12439 12679 12856 12865 12889 12890 13065 13262 13688 13743 14266 14419 14673 14709 14772 14858 14910 15239 15311 15516 15530 15548 15598 15602 15960 16041 16137 17341 18440 18450 18496 18666 18761 19323 19466 19836 20071 21477 22014 22040 22148 22252 22289 22309 22645 22709 22807 23018 23363 23564 23575 23735 23738 24227 24249 25880 26583 26699 26706 26972 27459 27462 27731 27762 28343 28548 29458 30505 30576 30771 30833 31216 31781 32335 32491 36078 40679 40941 44379 44921 44937 489068.650015785639275e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/748/93?format=asciiInfraredOpticaldefaultJ/ApJ/748/93/starsTripleSpec nearby M dwarf sample: properties and spectral measurementsSimbadNameSimbad column added by the CDSmeta.idchare_[M/H][0.12] [M/H] uncertaintylog(Sun)stat.error;phys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharn_Name[abc] Alternative designation (G1)meta.notecharDist[1.8/41.9]? Star's distancepcpos.distance;pos.heliocentricfloatnullableVmag[7.49/19.74] V-band magnitudemagphot.mag;em.opt.Vfloatr_Vmag[1/8] Dist and Vmag reference (1)meta.ref;pos.frameintKsmag[3/11] 2MASS Ks-band magnitudemagphot.mag;em.IR.KfloatDateSpectrum observation datetime.epoch;obsnullableS/N[201/2079] Average signal-to-noise ratio obtained in the K-band continuumstat.snrintCommStar commentmeta.notecharFileFileName of individual spectrum in the "spectra" subdirectory (column added by CDS)meta.id;meta.filecharSpPlot of spectrum ({lambda}=1.95--2.45{mu}m)meta.id;meta.filecharFITSDownload the calibrated FITS spectrum ({lambda}=1.88--2.46{mu}m)meta.ref.urlcharEWNaINaI equivalent width0.1nmspect.line.eqWidthfloate_EWNaIEWNaI uncertainty0.1nmstat.errorfloatEWCaICaI equivalent width0.1nmspect.line.eqWidthfloate_EWCaIEWCaI uncertainty0.1nmstat.errorfloatH2O-K2H_2_O-K2 index (2)spect.indexfloate_H2O-K2H20-K2 uncertaintystat.errorfloatSpT[0/9] M-spectral subtypesrc.spTypeintTeff[2492/4031]? Effective temperatureKphys.temperature.effectiveintnullablee_Teff[15/106]? Teff uncertaintyKstat.error;phys.temperature.effectiveintnullable[M/H][-0.45/0.33] Overall metallicity (3)log(Sun)phys.abund.Zfloat[Fe/H][-0.64/0.46] [Fe/H] metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.17/0.18] [Fe/H] uncertaintylog(Sun)stat.error;phys.abund.Fefloat_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main